<template>
	<div class="goodsinfo-container">
		<transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
			<!-- ref获取该普通标签的dom -->
			<div class="ball" v-show="ballFlag" ref="ball"></div>
		</transition>

		<!-- 商品轮播图区 -->

		<div class="mui-card">
			<div class="mui-card-content">
				<div class="mui-card-content-inner">
					<!-- 轮播图 -->
					<swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
				</div>
			</div>
		</div>
		<!-- 商品购买区 -->
		<div class="mui-card">
			<div class="mui-card-header">{{ goodsinfo.title }}</div>
			<div class="mui-card-content">
				<div class="mui-card-content-inner">
					<p class="price">
						市场价：<del>￥{{ goodsinfo.market_price }}</del
						>&nbsp;&nbsp;销售价：<span class="now_price">{{ goodsinfo.sell_price }}</span>
					</p>
					<p>
						购买量:
						<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
					</p>
					<p>
						<mt-button type="primary" size="small">立即购买</mt-button>
						<mt-button type="danger" size="small" @click="addToshopCar">加入购物车</mt-button>
						<!-- //numbox的数值变化，点击加入购物车，购物车组件拿到子组件numbox的值，子向父传值 -->
					</p>
				</div>
			</div>
		</div>
		<!-- 商品参数区 -->
		<div class="mui-card">
			<div class="mui-card-header">商品参数</div>
			<div class="mui-card-content">
				<div class="mui-card-content-inner">
					<p>商品货号:{{ goodsinfo.goods_no }}</p>
					<p>库存情况：{{ goodsinfo.stock_quantity }}件</p>
					<p>上架时间：{{ goodsinfo.add_time | dateFormat('YYYY - MM - DD') }}</p>
				</div>
			</div>
			<div class="mui-card-footer">
				<mt-button type="primary" size="large" @click="goDesc(id)">图文介绍</mt-button>
				<mt-button type="danger" size="large" @click="getComment(id)">商品评论</mt-button>
			</div>
		</div>
	</div>
</template>
<script>
import swiper from '../subcomponents/swiper.vue'
import numbox from '../subcomponents/goodsinfo_numbox.vue'
export default {
	data() {
		return {
			id: this.$route.params.id,
			lunbotu: [], //轮播图数据
			goodsinfo: {},
			ballFlag: false, //控制小球隐藏和显示的标识符
			selectedCount: 1, //默认用户选中商品数量1
		}
	},
	created() {
		this.getLunbotu()
		this.getgoodsinfo()
	},
	methods: {
		//   轮播图
		getLunbotu() {
			this.$http.get('api/getthumimages/' + this.id).then(result => {
				if (result.body.status === 0) {
					result.body.message.forEach(item => {
						item.img = item.src
					})
					this.lunbotu = result.body.message
				}
			})
		},
		//商品信息
		getgoodsinfo() {
			this.$http.get('api/goods/getinfo/' + this.id).then(result => {
				if (result.body.status === 0) {
					this.goodsinfo = result.body.message[0]
				}
			})
		},
		goDesc(id) {
			//点击使用编程时导航，转到图文介绍页面
			this.$router.push({ name: 'goodsdesc', params: { id } })
		},
		getComment(id) {
			//点击跳转到评论页面
			this.$router.push({ name: 'goodscomment', params: { id } })
		},
		addToshopCar() {
			//小球隐藏
			this.ballFlag = !this.ballFlag
			var goodsinfo = { id: this.id, count: this.selectedCount, price: this.goodsinfo.sell_price, selected: true }
			//调用state中的方法
			this.$store.commit('addToCar', goodsinfo)
		},
		//小球动画
		beforeEnter(el) {
			el.style.transform = 'translate(0,0)'
		},
		enter(el, done) {
			//获取小球在页面中的位置，在组件件使用dom，可以拿到任何元素，与是否是父子组件无关
			const ballPosition = this.$refs.ball.getBoundingClientRect()
			//获取徽标的位置
			const badgePosition = document.getElementById('badge').getBoundingClientRect()
			const xDist = badgePosition.left - ballPosition.left
			const yDist = badgePosition.top - ballPosition.top
			//   el.offsetWidth;
			el.style.transform = `translate(${xDist}px,${yDist}px)`
			el.style.transition = 'all 0.5s cubic-bezier(.4,-0.3,1,.68'
			done() //执行下一个半场函数
		},
		afterEnter(el) {
			this.ballFlag = !this.ballFlag
		},
		getSelectedCount(count) {
			//当子组件把选中的数量传给父组件，把选中的值保存到selectedCount上
			this.selectedCount = count
			console.log('父组件拿到的值：' + this.selectedCount)
		},
	},
	components: {
		swiper,
		numbox,
	},
}
</script>
<style lang="scss" scoped>
.goodsinfo-container {
	background-color: #eee;
	overflow: hidden;
	.now_price {
		color: red;
		font-size: 16px;
		font-weight: bold;
	}
	.mui-card-footer {
		display: block;
		button {
			margin: 10px 0;
		}
	}
	.ball {
		width: 15px;
		height: 15px;
		border-radius: 50%;
		background-color: red;
		position: absolute;
		z-index: 99;
		top: 390px;
		left: 120px;
	}
}
</style>
